If I understand your question, you're asking which is is the category against which each other dummy-coded category is compared?
You select it when you dummy code. When you have K categories, you create K-1 dummy variables and one group has a zero on all K-1 dummy variables. That group is the reference group. Think about it... the model for that group is missing the dummy coded variable and each of the remaining K-1 variables each have a regression coefficient that compares them to the reference group. -Alan On 9/29/2016 9:13 AM, Jack Drew wrote: > I use PSPP (current version 0.10.2) to generate linear regression > models. But, after checking the manual and help archive, I'm still > having difficulty understanding how PSPP treats the reference > categories for dummy variables, and if/how/what PSPP options let you > set the reference. > > Please could someone be kind enough to explain this feature in PSPP. > > Thank you. Jack > > -- > Jack Drew > Senior Institutional Research Analyst > Office of Institutional Research > Mott Community College > > > _______________________________________________ > Pspp-users mailing list > Pspp-users@gnu.org > https://lists.gnu.org/mailman/listinfo/pspp-users -- Alan D. Mead, Ph.D. President, Talent Algorithms Inc. science + technology = better workers +815.588.3846 (Office) +267.334.4143 (Mobile) http://www.alanmead.org I've... seen things you people wouldn't believe... functions on fire in a copy of Orion. I watched C-Sharp glitter in the dark near a programmable gate. All those moments will be lost in time, like Ruby... on... Rails... Time for Pi. --"The Register" user Alister, applying the famous "Blade Runner" speech to software development
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